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<H1>[Mageia-discuss] Temporarily changing IP address</H1>
<B>Anne Wilson</B>
<A HREF="mailto:mageia-discuss%40mageia.org?Subject=Re%3A%20%5BMageia-discuss%5D%20Temporarily%20changing%20IP%20address&In-Reply-To=%3C4FBBD1FD.5040701%40kde.org%3E"
TITLE="[Mageia-discuss] Temporarily changing IP address">annew at kde.org
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<I>Tue May 22 19:50:53 CEST 2012</I>
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<PRE>-----BEGIN PGP SIGNED MESSAGE-----
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On 22/05/12 17:12, Anne Wilson wrote:
><i> On 22/05/12 16:59, AL13N wrote:
</I>>>><i> On 22/05/12 15:08, AL13N wrote:
</I>>>>>>>><i> No :-( No difference, even though I restarted the
</I>>>>>>>><i> network service,
</I>>>>>><i>
</I>>>>>><i> Lets start from scratch.
</I>>>>>><i>
</I>>>>>><i> But first, can you tell me the ip address of the NAS and
</I>>>>>><i> your laptop's IP address for eth0.
</I>>>>>><i>
</I>>>>>><i> After making note of these, put the laptop back to it's
</I>>>>>><i> original config. (i.e. remove the manually created
</I>>>>>><i> interface) and set wlan0 not to come up on reboot. Then
</I>>>>>><i> restart so you only have an ip address on eth0.
</I>>>>>><i>
</I>>>>>><i> Then send me the info.
</I>>>>>><i>
</I>>>>>><i> Doug
</I>>>>><i>
</I>>>>><i> in fact, if we want it to be even simpler, you could add the
</I>>>>><i> ip address without a alias interface wit iproute2
</I>>>>><i>
</I>>>>><i> []# ip addr show eth0
</I>>>><i>
</I>>>><i> # ip addr show eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP>
</I>>>><i> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether
</I>>>><i> 1c:75:08:28:bd:e4 brd ff:ff:ff:ff:ff:ff inet 169.254.100.1/24
</I>>>><i> brd 169.254.100.255 scope global eth0 inet6
</I>>>><i> fe80::1e75:8ff:fe28:bde4/64 scope link valid_lft forever
</I>>>><i> preferred_lft forever
</I>>>><i>
</I>>>>><i> []# ip addr add www.xxx.yyy.zzz/netmask dev eth0
</I>>>><i>
</I>>>><i> # ip addr add www.192.168.0.20/255.255.255.0 dev eth0 Error:
</I>>>><i> an inet prefix is expected rather than
</I>>>><i> "www.192.168.0.20/255.255.255.0".
</I>>>><i>
</I>>>><i> Not sure what it is expecting.
</I>><i>
</I>>><i> hum, i meant the socalled CIDR notation: 4 parts of ip address
</I>>><i> followed by a subnet mask,
</I>><i>
</I>>><i> in your case, i'd do:
</I>><i>
</I>>><i> []# ip addr add 192.168.0.20/24 dev eth0
</I>><i>
</I>><i> Meanwhile, I played with alternatives, knowing that it must be
</I>><i> something close to what I'd already tried. So,
</I>><i>
</I>><i> # ip addr add 192.168.0.20/255.255.255.0 dev eth0 # ip addr show
</I>><i> eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
</I>><i> pfifo_fast state UP qlen 1000 link/ether 1c:75:08:28:bd:e4 brd
</I>><i> ff:ff:ff:ff:ff:ff inet 169.254.100.1/24 brd 169.254.100.255 scope
</I>><i> global eth0 inet 192.168.0.20/24 scope global eth0 inet6
</I>><i> fe80::1e75:8ff:fe28:bde4/64 scope link valid_lft forever
</I>><i> preferred_lft forever
</I>><i>
</I>><i> So now it appears to have two addresses, preferring the wrong one.
</I>><i>
</I>>><i> then if you do
</I>><i>
</I>>><i> []# ip addr show eth0
</I>><i>
</I>>><i> again, you'd see it was there, as well as the extra route for
</I>>><i> that range:
</I>><i>
</I>>><i> []# ip route
</I>><i>
</I>><i> # ip route default via 192.168.0.1 dev eth1 proto static default
</I>><i> via 169.254.100.100 dev eth0 metric 10 default via 192.168.0.1 dev
</I>><i> eth1 metric 10 169.254.100.0/24 dev eth0 proto kernel scope link
</I>><i> src 169.254.100.1 metric 10 192.168.0.0/24 dev eth1 proto kernel
</I>><i> scope link src 192.168.0.101 192.168.0.0/24 dev eth0 proto kernel
</I>><i> scope link src 192.168.0.20
</I>><i>
</I>><i> ifconfig eth0 Link encap:Ethernet HWaddr 1C:75:08:28:BD:E4
</I>><i> inet addr:169.254.100.1 Bcast:169.254.100.255 Mask:255.255.255.0
</I>><i>
</I>>>><i>
</I>>>><i> Shorewall and iptables are currently stopped.
</I>><i>
</I>>><i> Be careful of this, in your case, it might not matter, but
</I>>><i> shorewall stop has policy DROP, (i think), allthough iptables
</I>>><i> should have policy ACCEPT.
</I>><i>
</I>>><i> so, you'd have to stop shorewall first, then stop iptables.
</I>><i>
</I>><i> That's the order I did it.
</I>><i>
</I>>><i> personally, i'd rather not stop the firewall, due to security
</I>>><i> reasons though. but since with this solution, you don't have any
</I>>><i> extra interface, even just restarting it would be fine.
</I>><i>
</I>><i> Once I have a connection I'll restart them.
</I>><i>
</I>>><i> if you want to debug even further:
</I>><i>
</I>>><i> []# tcpdump -n -i eth0 host <nas_ip>
</I>><i>
</I>><i> Where does that write to? A log file?
</I>><i>
</I>>><i> and try to connect and then you can see what sourceip and destip
</I>>><i> are set and if a reply is coming back.
</I>><i>
</I>><i> At the end of this, though, I can ping both the NAS on
</I>><i> 192.168.0.200 and other LAN connections.
</I>><i>
</I>><i> Last question, then, is whether this is a permanent change?
</I>><i>
</I>><i> Anne
</I>><i>
</I>Clearly it isn't. Dolphin froze and wouldn't restart,then I lost half
of my display, so I shut down and gave it 30mins. rest, to make sure
that nothing was cached. On reboot, it was back to 169.254.100.1.
I can go through the steps again, but how can I make it permanent?
Anne
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